Why is anal sex enjoyable?

What’s the evolutionary basis? Lucky mistake?

A few people offer their ideas, though the first and most popular answer, has in my humble opinion the most merit.

Amongst several theories is one which caught my eye:

Dilation of the inner sphincter and rectal cavity stimulates the parasympathetic nervous system via the vagus nerve. It has a calming effect which some interpret as increased ability to relax or to submit to a partner.

It’s good to see that despite the fact that mainstream scientific research seem to feel this is a subject not worthy of investigation, some people are giving serious consideration to this important aspect of human sexual behaviour.

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